| 摘要 |
PURPOSE:To attain the absence communication by using an absence key in a loop-formed network. CONSTITUTION:In the state transition of the absence communication system, the states up to the state 5 (transmission) from the state 0 (reset) are of the conversation form where the communication is performed while the user is present. The state restores to the state 0 (reset) at hook-on in this state. In case of absence, the absence reset state 7 is obtained by turning on the absence key at a terminal device side and the power supply is interrupted also. When an incoming call comes in this case, the state becomes the receiving enable check state so as to check whether or not the preparation of receiving is finished. When the receiving is enabled, the state 9 (receiving) is obtained and when the receiving is disabled, the state restores to the state 7. The state 9 is a state whether a terminal is in the receiving state or in the standby state, and when the receiving is good in this case, the state becomes the standby state requesting the next receiving and when the receiving is not good, the state becomes the state 10 (standby) requesting retransmission. |
